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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated APX803L40-38SA-7

Name: APX803L40-38SA-7
Brand: Diodes Incorporated
SKU: APX803L40-38SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L40-38SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: APX803L40-38SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L40-38SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing 4.0V fixed threshold detection with ±1.5% accuracy, 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23 package - used to ensure reliable power-on reset in battery-powered IoT sensors and portable medical monitors.

For engineers reviewing the APX803L40-38SA-7 datasheet, APX803L40-38SA-7 pinout, APX803L40-38SA-7 application, or APX803L40-38SA-7 equivalent, this page delivers verified technical context, real-world timing behavior, package-specific pin validation, and confirmed alternative options for power-supply monitoring in space-constrained embedded systems.

Technical Context

The APX803L40-38SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during V_CC recovery, coupled with an internal RC timer that generates a fixed 450ms reset pulse after V_CC drops below 4.0V. Its open-drain output supports wired-OR configuration with external pull-up for system-level reset arbitration.

It operates across -40°C to +85°C ambient, maintains threshold stability within ±50 ppm/°C over temperature, and requires no external components - enabling direct integration into low-voltage (0.9–5.5V) microcontroller power rails without loading or calibration overhead.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.0V ±1.5% - ensures deterministic reset assertion when main supply falls below safe MCU operating voltage.
Supply Current	1.0µA (typ.) - negligible load on coin-cell or energy-harvesting power sources.
Reset Timeout	450ms (typ.) - holds reset long enough for full µP initialization and clock stabilization.
Output Type	Open-drain, active-low - enables flexible reset bus sharing and compatibility with 1.8V–5V logic families.
Response Time	20µs - guarantees fast fault capture before system state corruption occurs.
Operating Voltage	0.9V to 5.5V - supports wide-input LDO outputs and direct connection to Li-ion or multi-cell battery rails.
Hysteresis	0.01×V_TH (40mV) - prevents chatter during slow-rising or noisy supply transitions.

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm × 1.0mm body, gull-wing leads, RoHS-compliant matte tin finish.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Reference ground return path; must be connected directly to PCB ground plane for stable threshold accuracy.
2	RESET	Open-drain output; sinks up to 20mA; requires external pull-up resistor to host V_CC or higher rail.
3	V_CC	Power input; supplies internal reference and comparator; decoupling capacitor (100nF) required at pin.

Key Features

Feature	Design Value
Ultra-low quiescent current	1.0µA typ. - extends battery life in always-on edge nodes beyond 10 years on CR2032.
Fixed 4.0V threshold	Factory-trimmed, no external resistor network needed - reduces BOM count and layout area.
450ms reset delay	Internally generated, temperature-stable - eliminates need for external RC timing components.
High accuracy over temperature	±1.5% @25°C, ±50 ppm/°C drift - meets industrial-grade reset margin requirements without calibration.
Robust ESD protection	±4000V HBM - withstands handling and board assembly stress without latch-up or parametric shift.

Applications

Smart Wearable Sensors

Industrial PLC I/O Modules

Use Scenario: Continuous ECG monitoring patch powered by thin-film battery with 3.3V LDO output.

IC Role / Device Role / Timing Role: Monitors LDO output and asserts RESET until V_CC stabilizes above 4.0V post-power-up, ensuring clean MCU boot before analog front-end activation.

Use Value: Prevents firmware lockup during brown-out events caused by transient battery sag under RF transmission bursts.

Use Scenario: DIN-rail mounted digital input module operating in factory-floor environments with 24V DC supply and local 5V regulation.

IC Role / Device Role / Timing Role: Supervises 5V rail feeding FPGA configuration memory and I/O drivers; 450ms timeout aligns with worst-case FPGA startup sequence.

Use Value: Guarantees deterministic re-initialization after line transients or hot-swap events without requiring external watchdog coordination.

Portable Diagnostic Handhelds

Automotive Telematics Gateways

Use Scenario: Battery-operated ultrasound probe with dual-core ARM Cortex-M7/M4 SoC and 1.8V/3.3V/5V power domains.

IC Role / Device Role / Timing Role: Dedicated 4.0V monitor on main 5V domain triggers global system reset if primary buck converter fails or enters hiccup mode.

Use Value: Eliminates risk of partial initialization where only one core boots, avoiding undefined peripheral states and data corruption.

Use Scenario: CAN-connected telematics unit powered via automotive 12V-to-5V DC/DC with cold-cranking immunity.

IC Role / Device Role / Timing Role: Detects 5V rail collapse during engine start (dips to ~3.5V); 450ms hold-off prevents spurious resets during cranking transients.

Use Value: Maintains GPS timekeeping and cellular session continuity through 500ms cranking dips without losing network registration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G33DBVR	3.3V threshold, 200ms default delay, 1.1µA supply current, same SOT23-3 footprint.	Requires external capacitor for adjustable delay; lacks factory-programmed 450ms option.	Select when 3.3V supervision suffices and delay flexibility is preferred over fixed timing.
MAX809SEUR+T	4.0V threshold, 140ms delay, 12µA supply current, SOT23-3 package.	Higher ICC reduces battery lifetime in ultra-low-power designs; shorter delay may not meet FPGA boot timing.	Choose only for cost-sensitive non-battery applications where 140ms reset hold is sufficient.

Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L40-38SA-7 uniquely combines factory-set 4.0V/450ms operation, sub-µA ICC, and zero-component implementation - making it optimal for space- and energy-constrained designs where timing precision and power efficiency are co-critical.

Availability

APX803L40-38SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLCs, portable diagnostics, and automotive telematics requiring stable component supply across extended product lifecycles.

Supply support for APX803L40-38SA-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series belongs to Diodes' Power Management portfolio, engineered specifically for ultra-low-power, high-accuracy voltage supervision in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L40-38SA-7?

The APX803L40-38SA-7 has a nominal reset threshold of 4.0V with a guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), corresponding to a range of 3.94V to 4.06V at 25°C per DS38171 Rev. 3–2, Section 4.3.

Does APX803L40-38SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the monitored supply or host logic rail is mandatory; typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.

Can APX803L40-38SA-7 operate from a 1.8V supply?

No - the minimum operating supply voltage is 0.9V, but the 4.0V threshold requires V_CC ≥ 4.0V to assert reset; it cannot supervise rails below its threshold. For 1.8V supervision, select APX803L18-XXSA-7 (1.8V variant).

Is APX803L40-38SA-7 qualified for automotive applications?

No - while Diodes offers AEC-Q100-qualified variants in the APX803L family (e.g., APX803L40-42SR), the SA suffix denotes commercial-grade SOT23 packaging without automotive qualification; consult Diodes' automotive product definitions for PPAP-capable alternatives.

APX803L40-38SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 3.8V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 292ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L40-38SA-7 FAQ

1.How can I place an order for APX803L40-38SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L40-38SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for APX803L40-38SA-7 reliable?

The price and inventory of APX803L40-38SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-38SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L40-38SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-38SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L40-38SA-7?

APX803L40-38SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L40-38SA-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for APX803L40-38SA-7?

For technical support, including APX803L40-38SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-38SA-7 requirements.

6.How does Aetrix verify that APX803L40-38SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L40-38SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that APX803L40-38SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L40-38SA-7?

All APX803L40-38SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-38SA-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The APX803L40-38SA-7 part is unused and in its original packaging.

Return procedure for APX803L40-38SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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